Well-drilling tool



J 1927' E. A. ROBINSON WELL DRILLING TOOL Filed Dec. 10. 1926 Patented July 5, 1927.

ma e EDWARD A. ROBINSON, OF ATLANTA, GEORGIA.

WELL-DRILLING TOOL.

Application filed December 10 1926. Serial No. 153,833.

My invention relates to well drilling tools and means for connecting the tools to the pipes or tubes and also for connecting the sections of the pipe together and has for its object to provide a combination drilling and cutting tool carried at the lower end of a series of pipe sections, said sections being provided with a safety cable connection so as to enable the pulling of the tool. from the well should any of the pipe sections become broken. 1

A further object of the invention is to provide a rotary cutting and drilling tool which may be easily and quickly detached for replacing when. the same becomes worn,which is strong and durable in construction, efiicient in operation and relatively inexpensive to manufacture.

Other objects and advantages reside in the novel combination and arrangement of the constructionmore fully described and set forth in the following specification and claims, reference being had to the accompanying drawing forming part hereof and in whlch Figure 1 is a view in elevation of the drilling and cutting tool attached to a pipe section, p

Figure 2 is a vertical sectional view through one of the pipe section connections,

Fi ure 3 is a vertical sectional view v throii gh the drilling and cutting tool,

Figure 4 is a transverse sectional view taken along a line 44 of Figure 1 and,

Figure 5 is a top plan view of one of the cable connecting collars.

Referring now to the drawing I have disclosed a preferred embodiment of my invention which comprises substantially a combination rotary drilling and cutting tool for use in drilling wells and the like, said tool consisting of an upper section 5 which is round in cross section and having a plurality of openings 6 communicating with the interior thereof which is of a hollow construc tion upwardly from the openings. The section below the openings is of a solid construction and is formed integral with an enlarged head 7 the head being tapered clownwardly and comprising upper and lower sections, the lower section 8 constituting the drilling element and is tapered to a sharpened point and is provided with ya threaded stud 9 for insertion in a threaded bore provided in the base of the upper section of the head, said upper section constituting the cutting element. The abutting edges of the drilling and cutting elements are provided with annular flanges 10 through which bolts 11 may be inserted so as to firmly attach the parts. The cutting element of the head may be provided with cutting edges or blades 12 longitudinally or spirally arranged thereon as desired and may be formed integrallytherewith or if desired may be removably attached for replacement. The drilling point may alsobe provided with any con ventional type of cutting device;

The upper end of the section 5 is exter nally threaded and is adapted to be secured to a pipe section 13 by a coupling 14. The

upper end of the section 5 and the ends of the pipe sections are also internally threaded and adapted to receive an annular ring 15 in eachof the communicating ends, the ring being provided with oppositely formed shoulders 16 along the inner periphery of the ring, said shoulders having threaded openings 17 therein. The rings carried withmule upper ends of the pipe sections" are pro'i'ided with a pair of internally and externally threaded standards 18 threadedly inserted in the threaded opening 17 and eX-' tending upwardly beyond the upper edge of the pipe section 13. The ring in'the lower end of the next succeeding pipe section is vrovided with a air of externallv threaded sockets 19 threadedly, inserted in the openings of the ring and having a reduced e2;-

ternally threaded pin 20, adapted to be threadedly inserted within the standards 18.

A pair of cables 21 are arranged within each pipe section having their upper ends fixedly secured to the standard 18 and the lower ends fixedly secured to the sockets 19. The pipe sections are thus provided with a safety attachment designed for withdrawing the re maining sections should any become broken.

The hollow end of the cutting element is also provided with internal threads for receiving one of the rings 15 so as to be included in the connection with the cable. The drilling point of the cutting device may be removed and replaced with points of dif ferent styles for use under varying conditions.

I claim:

1. A device of the character described comprising a plurality of pipe sections adapted to detachably carry a drilling tool at the lower end thereof and an auxiliary connection between said sections comprising .tion between said sections and a pair of rings arranged in the adjoining ends of the pipe sections and means within said sections connecting said rings.

2. A device of the character described comprising a plurality of pipe sections adapted to dctachably carry a tool at the lower end thereof: and an auxiliary connection between said sections and between the tool and said sections comprisi a ring arranged within each end of said sections and in the upper end of the tool and means connecting said rings.

. device of the character descr'ied comprising a plurality of pipe sections adapted'to d-etachably carry tool a the lower end thereof and an auxiliary connecbetween the tool and said sections comprising a ring arranged within each end of said sections and in the upper end of the tool and sectional cable connecting said rings.

4:. A device otthe characte described comprising a plurality of pipe sections adapted to detachably carry a tool the lower end thereof and an auxiliary connection between said sections 1nd between the tool and said sections comprising a arranged within each end of sections and in the upper end of the tool and a 3 connection between the rings n section and a rigid connection between rings in the adjoining sections.

5. A *device of the character described comprising a plurality of pipe sections adapted to detachably carry atool at the lower end thereor" and an auxiliary connection between said sections and between the tool and said sections comprising a ring arranged within each end of said sections and in the upper end of the tool and a section of cable connecting the rings within each pipe section and a threaded connection be tween each cable section.

6. A device of the character describe-c comprising a plurality of pipe sections adapted to detachably carry a tool the lower end thereof and an auxiliary connection tion between said sections and between the tool and said sections comprising a ring arranged within each end of said sections and in the upper end of the tool having a pair of openings arranged at opposite sides thereof and a pair of cable sections arranger within each pipe section, one end or" each cable section having a threaded plug insertable in an opening in one of the rin s and the opposite end of the cible having a threaded socket insertable in an opening in the opposite ring whereby to form a continuous connection between said cable sections.

8. A device oi? the character cescribed comprising a plurality oi" pipe sections adapted to detachably carry a tool at the lower end thereof and an auxiliary connecbetween said sections and between the tool and said sections comprising a ring threadedly carried within each end of said sections and in the upper end oi the tool having a pair of openings arranged at oppoite sides thereof and a pair of cable sections arranged within each pipe section; one end of, each cable section having a threaded plug insertable in an openinn' in one of the rings and the opposite end ot the cable having a threaded socket insertahle in an opening in the opposite ring whereby to form a continuous connection between said cable sections.

In testimony whereof I a'fiix my signature.

EDWARD A. ROBINSON. 

